How many solutions does the equation below have? 2(4x + 10) = 8x + 20
O 2 Solutions
O No Solution
0 1
O infinitely many Solutions

Find the value of the variable and the length of each secant segment.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .